The analysis of the galaxy base will be made on the basis of the galaxies.dsc file, which contains 10,937 galaxies.Elliptical galaxies are denoted by the letter E and the number, which is the index of flattening of the galaxy.In the analyzed database, there are a total of 9 types of elliptical galaxies: E0, E1, E2, E3, E4, E5, E6, S0 (lenticular).Quantitative composition of elliptical galaxies:

E0-1503

E1 - 57

E2 - 44

E3 - 50

E4 - 27

E5 - 24

E6 - 20

S0 - 3277

Total: 5002 (45.7%)

The sprite image of an elliptical galaxy is created on the basis of matrices:

The database contains 664 (6.1%) irregular galaxies. There are no special matrices for creating a sprite image of "Irr" type galaxies.

The sprite image of a spiral galaxy is created on the basis of matrices:

In the top row there are 4 left-handed matrices, in the lower row there are 2 right-hand matrices.This is a very incomprehensible fact. There should be 6 left-handed matrices and 6 right-handed matrices. Only 12 matrices for spiral galaxies.================================================= ==============Summing up the spiral galaxies:

I did notice that the templates for barred spiral galaxies are going in an opposite direction compared to the unbarred spiral galaxies. But instead of making 6 more templates, what if you just flipped the orientation of the galaxies using the Axis and Angle parameters? (I, however, don't really understand how those parameters work.)

The sum of the squares of the numbers in the Axis row is equal to 1. This is similar to the unit vector, whose starting point has coordinates (0; 0; 0). Therefore, to invert the direction of the vector, you can try to change the signs of all three numbers in the Axis line to opposite ones. Angle must be left unchanged.

An individual matrix is connected using the CustomTemplate operator.The matrix takes up very little disk space.If you ask the creation of matrices for irregular galaxies, then all the matrices will take about 20.5 x 664 = 13.6 MB (this is a bit).

Individual matrices can be created from photos of stars. Example, the galaxy Cartwheel. Here is a photo and a matrix:

cartwheel galaxy.png (40.16 KiB) Viewed 493 times

Here is a sprite image created by Celestia:

Note. The matrix cartwheel galaxy.png is taken from Project "Celestia Origin", release dated August 30, 2018

Some of the galaxies named in the list are rarely called that name. For example, the "UFO Galaxy" is merely a nickname, and scientists call it NGC 2683 (see SIMBAD biblio). It doesn't really require a custom template. Likewise, a lot of the galaxies in the list are dwarf galaxies named after the constellation they're in, for example the Aquarius Dwarf, Bootes Dwarf Spheroidal Galaxy, Leo T, etc. If we used a custom template, the galaxy would be flat, but dwarf galaxies are supposed to be round blobs. (Although if we had support for adding custom structures for dwarf galaxies, that would be cool.)

There are plenty of galaxies that do need templates though, some on this list and others not. Arp 147 looks much better with this template (modified from this image by NASA, under public domain):